FIELD: pharmaceuticals.
SUBSTANCE: invention relates to a process for preparing a compound of formula (III) comprising contacting a compound of formula (II), where R is -C1-C6 alkyl, with N-bromosuccinimide (NBS) and a solvent. Invention also relates to a process for preparing compound 4, to a process for preparing compound 1, to a reaction mixture for preparing a compound of formula (III), to a reaction mixture to preparing compound 4, to a reaction mixture for preparing compound 1, to compound 2, to a reaction mixture to preparing a compound of formula (II).
Formula (III); 
Formula (II);
Compound 1; 
(Compound 2);
(Compound 4).
EFFECT: proposed is a novel process for preparing compound 1, which can be implemented on a large scale.
19 cl, 20 dwg, 16 ex
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